Light-driven Topological and Magnetic Phase Transitions in Thin-layer Antiferromagnets

dc.creatorRodriguez-Vega, Martin
dc.creatorLin, Ze-Xun
dc.creatorLeonardo, Aritz
dc.creatorErnst, A.
dc.creatorVergniory, M. G.
dc.creatorFiete, Gregory A.
dc.description.abstractWe theoretically study the effect of low-frequency light pulses in resonance with phonons in the topological and magnetically ordered two septuple-layer (2-SL) MnBi2Te4 (MBT) and MnSb2Te4 (MST). These materials share symmetry properties and an an- tiferromagnetic ground state in pristine form but present different magnetic exchange interactions. In both materials, shear and breathing Raman phonons can be excited via non-linear interactions with photo-excited infrared phonons using intense laser pulses attainable in current experimental setups. The light-induced transient lattice distor- tions lead to a change in the sign of the effective interlayer exchange interaction and magnetic order accompanied by a topological band transition. Furthermore, we show that moderate anti-site disorder, typically present in MBT and MST samples, can facil- itate such an effect. Therefore, our work establishes 2-SL MBT and MST as candidate platforms to achieve non-equilibrium magneto-topological phase transitions.
dc.description.departmentCenter for Dynamics and Control of Materials
dc.description.sponsorshipThis research was primarily supported by the National Science Foundation through the Center for Dynamics and Control of Materials: an NSF MRSEC under Cooperative Agreement No. DMR-1720595, with additional support from NSF DMR-1949701 and NSF DMR-2114825. This work was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY- 1607611. A.L. acknowledges support from the funding grant: PID2019-105488GB-I00. M. R-V. was supported by LANL LDRD Program and by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, Condensed Matter Theory Program. M.G.V. thanks support from the Spanish Ministry of Science and Innovation (grant number PID2019-109905GB-C21) and Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) GA 3314/1-1 – FOR 5249 (QUAST).
dc.relation.ispartofCenter for Dynamics and Control of Materials Publications
dc.titleLight-driven Topological and Magnetic Phase Transitions in Thin-layer Antiferromagnets

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